package com.dream21th.common.utils;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class AesEncryptUtil {

    //使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
    private static String KEY = "1234567890123456";

    private static String IV = "1234567890123456";


    /**
     * 加密方法
     * @param data  要加密的数据
     * @param key 加密key
     * @param iv 加密iv
     * @return 加密的结果
     * @throws Exception
     */
    public static String encrypt(String data, String key, String iv) throws Exception {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");//"算法/模式/补码方式"NoPadding PkcsPadding
            int blockSize = cipher.getBlockSize();

            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }

            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);

            return new Base64().encodeToString(encrypted);

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 解密方法
     * @param data 要解密的数据
     * @param key  解密key
     * @param iv 解密iv
     * @return 解密的结果
     * @throws Exception
     */
    public static String desEncrypt(String data, String key, String iv) throws Exception {
        try {
            byte[] encrypted1 = new Base64().decode(data);

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 使用默认的key和iv加密
     * @param data
     * @return
     * @throws Exception
     */
    public static String encrypt(String data) throws Exception {
        return encrypt(data, KEY, IV);
    }

    /**
     * 使用默认的key和iv解密
     * @param data
     * @return
     * @throws Exception
     */
    public static String desEncrypt(String data) throws Exception {
        return desEncrypt(data, KEY, IV);
    }



    /**
     * 测试
     */
    public static void main(String args[]) throws Exception {

        String test1 = "{\n" +
                "            \"channelCode\": \"string\",\n" +
                "            \"jfpalVersion\": \"string\",\n" +
                "            \"requestData\": {\n" +
                "              \"bizId\": 0,\n" +
                "              \"idNo\": \"string\",\n" +
                "              \"mobile\": \"string\",\n" +
                "              \"name\": \"string\",\n" +
                "              \"email\": \"string\",\n" +
                "              \"template\": \"string\",\n" +
                "              \"isRegist\": true,\n" +
                "              \"contractId\": \"string\",\n" +
                "              \"contractPam\": \"string\",\n" +
                "              \"tablePam\": \"string\",\n" +
                "              \"signUrl\": \"string\",\n" +
                "              \"records\": [\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": 111111,\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                },\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": 1121212121,\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                },\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": 331121,\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                },\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": \"string\",\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                },\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": 1.222,\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                },\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": \"string\",\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                },\n" +
                "                {\n" +
                "                  \"id\": 0,\n" +
                "                  \"name\": \"string\",\n" +
                "                  \"value\": \"string\",\n" +
                "                  \"code\": \"string\",\n" +
                "                  \"description\": \"string\",\n" +
                "                  \"groupCode\": \"string\",\n" +
                "                  \"typeCode\": \"string\",\n" +
                "                  \"sort\": \"string\",\n" +
                "                  \"isDelete\": \"string\"\n" +
                "                }\n" +
                "              ],\n" +
                "            },\n" +
                "            \"requestNo\": \"string\",\n" +
                "            \"requestTime\": \"string\",\n" +
                "            \"sysSource\": \"string\",\n" +
                "            \"userCode\": null,\n" +
                "            \"version\": \"\"\n" +
                "          }";
        String test =new String(test1.getBytes(),"UTF-8");
        String data = null;
        String key =  KEY;
        String iv = IV;
        // /g2wzfqvMOeazgtsUVbq1kmJawROa6mcRAzwG1/GeJ4=
        data = encrypt(test, key, iv);
        System.out.println("数据："+test);
        System.out.println("加密："+data);
        String jiemi =desEncrypt(data, key, iv).trim();
        System.out.println("解密："+jiemi);


    }
}
